Solve the equation by using the quadratic formula. 
Definitions:
Quantity Demanded
The total amount of a goods or services that consumers are willing and able to purchase at a given price level at a specific time.
Demand
Demand in economics refers to the quantity of a product or service that consumers are willing and able to purchase at various prices during a certain period.
Increase
A rise or growth in quantity, size, intensity, or another measure.
Demand Curve
A chart that illustrates the correlation between a product's price and the amount of it consumers want to buy, usually depicted as a line sloping downwards towards the right.
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